Alright, I figured this out. It was too critical for me. I submit this solution with the caveat that I am only about a week into OpenGoo (Feng) and do NOT fully understand the architecture etc. Their code is at the same time ridiculously complex and totally inspiring.
Plus, I just implemented this solution. So for all I know, I solved one problem and created another. But here is what I did:
IN THIS FILE: application/models/comments/Comments.class.php
CHANGE SORT ORDERS to: `created_on` DESC (4 of them)
This will display the comments in the correct (reverse) order. But the numbering will still be ascending (1..2..3..etc.). To change the numbering (3..2..1..):
IN THIS FILE: application/views/comment/object_comments.php
AND THIS FILE: application/views/comment/object_comments_for_print.php
CHANGE $counter=0 TO $counter=count($comments)+1
AND CHANGE $counter++ TO $counter--
